Rocking cut-off valve



(Nb Model.)

' L. MATHIAS 8n H. MENDENHALL.

ROCKING GUT-OPP VALVE.

Patented Sept. 13, 1887.

N. PETERs Phowutm h hor, Washington, D. u

lJNrTEn STATES ATEN'I rrrcn,

LEWIS MATHIAS AND HIRAM MENDENHALL, OF AUDUBON, IOlVA.

ROCKING CUT-OFF VALVE.

SPECIFICATION forming part of Letters Patent No. 369,802, dated September 13,1887.

Application filed May 18, 1887. Serial No. 233.633. (No model.)

To all whom, it may concern:

Be it known that we, LEWIS MATHIAs and HIRAM MENDENHALL, citizens of theUnited States, residing at Audubon, in the county of Audubon and State of Iowa, have invented certain new and useful Improvements in Rocking Out-Off Valves for Steam-Engines; and .we do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, mak- 1ng a part of this specification, and to the let ters .and figures of reference marked thereon.

Figure l of the drawings is a longitudinal section of our invention, taken through the cylinder and valve. Fig. 2 is a plan view of the valve-seat, and Fig. 3 a plan view of the face of the valve.

Thepresent invention has relation to that class of rotary valves that has its face upon one end, said face having ports through it for the admission of steam to the cylinder from the interior of the valve and a recess upon its face,

by which the steam is exhausted from inder.

The object of the invention is to construct a valve of this class that will be nearly balanced against the steam-pressure, easily operated,

the cyland simple in construetion,which objects we attain by the devices substantially as shown in the drawings, and hereinafter described and claimed.

In the accompanying drawings, A represents the steam-cylinder having the usual steam-passages, a, which lead to the valveseat 0, formed upon the side of the cylinder. Leading also into the seat is the exhaust-passage c, and into the center of the seat is screwed or otherwise secured a stud, d, to which the steam-pipe is connected.

The valve B consists of a cylinder with a closed end, which forms the face of the valve, and through this face is formed an opening, D, to permit the valve to be sleeved upon the, steam-pipe S, openings or steam-ports e also being provided,which register with the passages a alternately as the valve is moved. Upon the face of the valve is formed a recess, f, which registers with the passage 0 and either of the passages a, whereby an exhaustpassage is formed for either end of the cylinder, and upon the outside of the valve is formed a shoulder,

h, upon which the inner flange, i, of the sleeve or case E slightly bears to keep the valve in its proper position. This sleeve is bolted to the valve-seat through the outer flange, It, said sleeve being screw-threaded upon. its upper outside end,with which engages a cap-nut, F, a suitable packing being interposed between the valve and the sleeve, and above this nut is adjustably secured a yoked arm, G, by which the valve is operated. To close the upper end of the valve, the steam-pipe S has formed upon it a flange, H, of sufficient area in cross section to cause the pressure of steam within the valve to keep it on its seat, the remaining space intervening between the valve and flange being filled by a sleeve, I, which is attached to the valve. By this arrangement a steam-chest is formed within the valve, the steam being admitted from the pipe S through the opening 8 therein.

Upon the upper face of the flange on the steam-pipe and the sleeve on the valve is placed packing that is set up by the cap-nut M,which is secured upon the upper end of the valve.

In the operation the steam is admitted into the valve and passes through the port 6, and thence into the cylinder; at the same time the recess in the face of the valve has connected the passage a at the outer end of the cylinder with the exhaust-port c, and when the piston arrives at the end of its stroke the valve is re versed, by which the piston is driven in the opposite direction. The arm G is connected to the eccentric by a rod, which, forming no part of our invention, is not considered necessary to illustrate in the drawings.

Having now fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. In a rotary valve, the combination of a cylindrical valve, closed at one end and having ports therein and a recess upon its face and provided with a shoulder on its outer periphcry, with a sleeve having an inner flange which rests upon the said shoulder and an outer flange for bolting the sleeve to the cylinder, substantially as and for the purpose set forth.

2. The combination ofthe cylinder, provided with a valve-seat and steam and exhaust ports, with a stud located in the center of the seat, a

steam-pipe provided with openings screwed thereon, a rotary valve sleeved on the pipe, and a sleeve for retaining the valve in position, substantially as and for the purpose described.

3. In a rotary valve, a steam-pipe secured to the center of the valveseat and provided with a flange near the outer end of the valve, in combination with a cylindrical valve provided with a sleeve within and adjacent to the flange on the steam-pipe, substantially as and for the purpose specified.

4. In a rotary valve, a steam-pipe secured to the center of the valve-seat and provided with a flange near the outer end of the valve, in combination with a cylindrical valve having a sleeve within and adjacent to the flange on the steam-pipe and a shoulder on its outer surface, and a flanged sleeve for retaining the valve in place, substantially as and for the purpose set forth.

5. In a rotary valve, a steam-pipe secured to the center of the valve-seat and provided with a flange near the outer end of the valve, in combination with a cylindrical valve provided with a sleeve within and adjacent to said flange on the steam-pipe and the packing and capnut for retaining the same, substantially as shown and described.

In testimony that we claim the above we have hereunto subscribed our names in the presence of two witnesses.

LEWIS MATHIAS. HIRAM MENDENHALL.

Witnesses:

E. F. FREEMAN, D. L. FREEMAN. 

